Port mixed ventral region calculation method based on cargo transportation accessibility

Abstract

The invention is suitable for the technical field of port ventral region division, and provides a port mixed ventral region calculation method based on cargo transportation reachability, which comprises the following steps: on the basis of a cargo transportation station and a railway line vector layer, constructing a freight railway vector network in ArcGIS and carrying out topology check and correction; calculating the railway transportation distance from each urban railway station of the potential abdominal region to the harbor district based on the freight railway network; obtaining the shortest freight distance from each harbor district to each city by using a Baidu map path planning API; and according to the distance difference, delimiting the abdominal land types under the railway transportation mode and the road transportation mode, and then solving a union set of the abdominal land types under the two transportation conditions to obtain a final abdominal land type. According to the method, a more accurate, comprehensive and practical solution can be provided for division of the port ventral land, so that the overall operation efficiency of the port and the development of regional economy are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of port hinterland division, and in particular relates to a port mixed hinterland calculation method based on cargo transportation accessibility. Background Art

[0002] The hinterland of a port usually refers to the geographical scope of the source of cargo transportation and passenger traffic around the port. It can be analyzed and judged through the actual cargo data of the port, or formulated by the port administrative department through discussion. According to the existing relevant literature and actual situation, the hinterland of a port can be further divided into direct hinterland and indirect hinterland. Some adjacent ports even have competitive or cross hinterlands. Most researchers believe that the hinterland of a port refers to the area that can be radiated by the cargo throughput and passenger distribution of the port behind the port city. From the perspective of the port, the hinterland of a port refers to the attraction range of the port. At present, there are more than 50 ports distributed along my country's long coastline, and each port is divided into several port areas in space. There are problems such as strong subjectivity, lack of timeliness, and insufficient consideration of the basic conditions of railway and highway collection and distribution when defining the hinterland of a port based solely on cargo flow data and experience. There is a lack of a quantitative analysis method that considers comprehensive transportation modes. For this reason, a calculation method for the mixed hinterland of a port based on cargo transportation accessibility is proposed. Summary of the invention

[0003] The purpose of the present invention is to provide a port mixed hinterland calculation method based on cargo transportation accessibility, aiming to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for calculating the mixed hinterland of a port based on cargo transportation accessibility comprises the following steps:

[0006] Step 1: Calculate the railway transportation distance;

[0007] Step 2: Calculate the road transport distance;

[0008] Step 3: Delineation of hinterland types.

[0009] Further, the following specific steps are included:

[0010] Step 1: Based on the freight station and railway line vector layers, a freight railway vector network is constructed in ArcGIS, and topology check and correction are performed. Based on the freight railway network, the railway transportation distance from the railway stations in each city in the potential hinterland to the port area is calculated;

[0011] Step 2: Use Baidu Maps route planning API to obtain the shortest freight distance from each port area to each city;

[0012] Step 3: Determine the hinterland types under rail and road transport modes respectively, and then find the union of the hinterland types under the two transport conditions to obtain the final hinterland type.

[0013] Furthermore, the transportation distance method based on the Baidu map path planning API is expressed as:

[0014]

[0015] Among them, T is the total path time, s i is the length of the i-th road segment, v i is the speed of the ith road segment, u j is the time consumed at the jth intersection, m is the mode of transportation, p is the route selection preference, t i is the time period when driving the i-th road section, H is the historical time dataset for passing the intersection, and t j is the time period when passing through the jth intersection, f() is the speed calculation function, and f2() is the intersection time function.

[0016] Furthermore, in step 3, the hinterlands for both rail and road transport modes are divided according to the degree of distance advantage of the port area.

[0017] Furthermore, the specific process of step 3 is as follows:

[0018] Step 31, determine the exclusive port area: according to the distance difference between the city and different port areas, the city is divided into an exclusive hinterland and a mixed hinterland;

[0019] Step 32, dividing the mixed hinterland into a small mixed hinterland and a large mixed hinterland;

[0020] Step 33: Obtain the hinterland division results under the railway and road transport modes respectively according to step 31 and step 32, and obtain the union of the two hinterland division results as the final hinterland type division result.

[0021] Furthermore, the specific process of step 31 is as follows:

[0022] The port area closest to the port area set X in city ci is denoted as port area A, and the shortest distance is D1, where i = 1...n, n is the number of cities in the area to be divided; the shortest distance from ci to the port area set X2 outside A is D2, and the distance to the port area xi in the set X2 is di, where xi∈X; when D2 is much smaller than D1, that is, D1 / D2<0.5 or D2-D1>180km, city ci is considered to be the exclusive hinterland of port area A, otherwise city ci is the mixed hinterland of port area A and port area xi.

[0023] Furthermore, in step 32, the large mixed hinterland satisfies that the difference between the distance di from the city ci to its corresponding port area and the shortest port area distance D1 is less than 90 km, and D1 / di>0.8, otherwise it is a small mixed hinterland.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This port mixed hinterland calculation method based on cargo transportation accessibility can reduce the impact of subjective judgment and improve the accuracy and reliability of port hinterland division by using quantitative analysis methods; this method comprehensively considers various modes of transportation, including railways, roads, etc., and can more comprehensively evaluate the transportation efficiency and accessibility of cargo, thereby improving the overall operational efficiency of the port and the development of the regional economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of the present invention.

[0027] Figure 2 A flowchart for determining whether the hinterland is exclusive.

[0028] Figure 3 It is divided into hinterland areas for railway transportation mode.

[0029] Figure 4 It is divided into hinterland areas for road transport mode.

[0030] Figure 5 The types and divisions of the Beibu Gulf port hinterland are based on railways and highways. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0033] The present invention takes Beibu Gulf Port as an example. Based on the characteristics that Beibu Gulf Port is divided into three major port areas, namely Fangcheng Port Area, Qinzhou Port Area and Beihai Port Area, it is divided into Fangcheng Port Area, Qinzhou Port Area and Tieshan Port Area, and the hinterland is divided according to the distance from the railway and highway to the surrounding cities. The hinterland is limited to the southwest and central-south regions such as Hunan, Hubei, Guizhou, Chongqing, Sichuan, and Yunnan. Zhanjiang and Guangzhou Port are relatively close to Beibu Gulf Port and will divert part of the hinterland cargo, so they are also included in the hinterland calculation model, and Guangdong Province and Jiangxi Province, which are close to the two ports, are added to the hinterland division range.

[0034] like Figure 1As shown, a method for calculating the mixed hinterland of a port based on cargo transport accessibility is provided in one embodiment of the present invention. There are many factors affecting the actual hinterland. The present invention uses distance as the main condition affecting the hinterland division and determines the hinterland according to the spatial relationship between the city and the port area under the railway and road transportation modes. The following steps are included:

[0035] Step 1: Calculation of railway transportation distance: Based on the freight station and railway line vector layers, a freight railway vector network is constructed in ArcGIS, and topological checks and corrections are performed. Based on the freight railway network, the railway transportation distance from the railway stations of various cities in the potential hinterland to the port area is calculated. Among them, the railways of Fangchenggang and Qinzhou both converge at Qinzhou Station, and the distance difference to the hinterland is constant at 18 kilometers. The railway distance from the hinterland to Qinzhou Port is shorter than the distance to Tieshan Port except for Yulin City, Wuzhou City and Hezhou City.

[0036] Step 2: Calculation of road transport distance: Road types are complex and there are one-way roads, overpasses, highway entrances and exits, and other complex factors that affect the actual freight distance. The Baidu Maps route planning API is used to obtain the shortest freight distance from each port area to each city, and the hinterland type of the port area under road transportation is determined based on the distance difference. The transportation distance method based on the Baidu Maps route planning API is expressed as:

[0037]

[0038] Among them, T is the total path time, s i is the length of the i-th road segment, v i is the speed of the ith road segment, u j is the time consumed at the jth intersection, m is the mode of transportation, p is the route selection preference, t i is the time period when driving the i-th road section, H is the historical time dataset for passing the intersection, and t j is the time period when passing the jth intersection, f() is the speed calculation function, and f2() is the intersection time function. The transportation mode selected by the present invention is driving, and the route selection preference is set to the shortest total distance.

[0039] Step 3, Hinterland type delineation: Delineate the hinterland types under rail and road transport modes respectively, and then find the union of the hinterland types under the two transport conditions to obtain the final hinterland type. Among them, the hinterland under rail and road transport modes is divided according to the distance advantage of the port area. The specific process of step 3 is as follows:

[0040] Step 31, determine the exclusive port area: according to the distance difference between the city and different port areas, the city is divided into an exclusive hinterland and a mixed hinterland; the port area closest to the port area set X by city ci (i = 1...n, n is the number of cities to be divided) is recorded as port area A, and the shortest distance is D1; ​​ci to the port area set X2 outside A The shortest distance to port area xi (xi∈X) in set X2 is D2, and the distance to port area xi (xi∈X) in set X2 is di; when D2 is much smaller than D1 (D1 / D2<0.5 or D2-D1>180km, 180km is about the path distance of 3 hours of land transportation), it indicates that the distance cost from city A is much lower than that to the port area, and the city ci is considered to be the exclusive hinterland of port area A. Otherwise, when the distance di from city ci to port area xi does not meet the requirement of being much smaller than D1, city ci is the mixed hinterland of port area A and port area xi ( Figure 2 ).

[0041] Step 32, the mixed hinterland is divided into a small mixed hinterland and a large mixed hinterland: Tieshan Port, Qinfang Port and Zhanjiang Port are close to each other and have a prominent competitive relationship. They are the main subjects of port area division. At the same time, the mixed hinterland is large in scope. The mixed hinterland of these port areas is subdivided into a small mixed hinterland and a large mixed hinterland. A large mixed hinterland satisfies that the difference between the distance di from the city ci to its corresponding port area and the shortest port area distance D1 is less than 90km, and D1 / di>0.8, otherwise it is a small mixed hinterland.

[0042] Step 33: Obtain the hinterland division results under the railway and road transportation modes according to step 31 and step 32 respectively ( Figure 3 and Figure 4 ), find their union, and use it as the final hinterland type division result ( Figure 5 ).

[0043] Fangchenggang Port Area and Qinzhou Port Area are relatively close (referred to as Qinfang Port Area), and their hinterlands overlap. Tieshan Port Area, Qinfang Port Area and Zhanjiang Port are relatively close, and their competition is prominent, which is the main body of port area division. After a full arrangement of the hinterland relationship of different port areas, 10 hinterland types are finally formed, as shown in Table 1:

[0044] Table 1 Types and list of Beibu Gulf port hinterland

[0045]

[0046]

[0047] The above are only preferred embodiments of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the protection scope of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for calculating the mixed hinterland of a port based on cargo transport accessibility, characterized in that: The following steps are involved: Step 1: Calculate the railway transportation distance; Step 2: Calculate the road transport distance; Step 3: Delineation of hinterland types.

2. The method for calculating the mixed hinterland of a port based on cargo transport accessibility according to claim 1 is characterized in that: The specific steps include: Step 1: Based on the freight station and railway line vector layers, a freight railway vector network is constructed in ArcGIS and topology check and correction is performed. Based on the freight railway network, the railway transportation distance from the railway stations in each city in the potential hinterland to the port area is calculated; Step 2: Use Baidu Maps route planning API to obtain the shortest freight distance from each port area to each city; Step 3: Delineate the hinterland types under rail and road transport modes respectively, and then find the union of the hinterland types under the two transport conditions to obtain the final hinterland type.

3. The method for calculating the mixed hinterland of a port based on cargo transport accessibility according to claim 2 is characterized in that: The transportation distance method based on the Baidu Maps route planning API is expressed as: v i =f(m,p) v i =f(m,p,t i ) u j =f2(H,t j ) Among them, T is the total path time, s i is the length of the i-th road segment, v i is the speed of the ith road segment, u j is the time consumed at the jth intersection, m is the mode of transportation, p is the route selection preference, t i is the time period when driving the i-th road section, H is the historical time dataset for passing the intersection, and t j is the time period when passing through the jth intersection, f() is the speed calculation function, and f2() is the intersection time function.

4. The method for calculating the mixed hinterland of a port based on cargo transport accessibility according to claim 2 is characterized in that: In step 3, the hinterland of both rail and road transport modes is divided according to the degree of distance advantage of the port area.

5. The method for calculating the mixed hinterland of a port based on cargo transport accessibility according to claim 4 is characterized in that: The specific process of step 3 is as follows: Step 31, determine the exclusive port area: according to the distance difference between the city and different port areas, the city is divided into an exclusive hinterland and a mixed hinterland; Step 32, dividing the mixed hinterland into a small mixed hinterland and a large mixed hinterland; Step 33: Obtain the hinterland division results under the railway and road transport modes respectively according to step 31 and step 32, and obtain the union of the two hinterland division results as the final hinterland type division result.

6. The method for calculating the mixed hinterland of a port based on cargo transport accessibility according to claim 5, characterized in that: The specific process of step 31 is as follows: The port area closest to the port area set X in city ci is denoted as port area A, and the shortest distance is D1, where i = 1...n, n is the number of cities in the area to be divided; the shortest distance from ci to the port area set X2 outside A is D2, and the distance to the port area xi in the set X2 is di, where xi∈X; when D2 is much smaller than D1, that is, D1 / D2<0.5 or D2-D1>180km, city ci is considered to be the exclusive hinterland of port area A, otherwise city ci is the mixed hinterland of port area A and port area xi.

7. The method for calculating the mixed hinterland of a port based on cargo transport accessibility according to claim 5, characterized in that: In step 32, a large mixed hinterland satisfies the condition that the difference between the distance di from city ci to its corresponding port area and the shortest port area distance D1 is less than 90 km, and D1 / di>0.8, otherwise it is a small mixed hinterland.

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